Eyelet-shaped component and method for manufacturing the same

Abstract

The present invention provides a grommet-like component that is resistant to breakage and highly safe, with no distinction between front and back, and a method for manufacturing the same. [Solution] The present invention is a grommet-like part made of a hollow cylindrical metal part having an upper annular portion and a lower annular portion, having a first return portion in which the outer edge of the upper annular portion is curved radially outward and downward, and a second return portion in which the outer edge of the lower annular portion is curved radially outward and upward, and the plan view shapes of the upper annular portion and the lower annular portion are substantially the same.

Description

Technical Field

[0001] The present invention relates to a grommet-shaped component and a method for manufacturing the same.

Background Art

[0002] Grommet-shaped components are known for reinforcing holes made in cloth, leather, etc., or for bundling and fastening a plurality of objects to be stitched. Grommet-shaped components are generally called eyelets, washers, etc., and include grommet-shaped components composed of a grommet main body and a washer, and grommet-shaped components called chrysanthemum split grommets that are attached by radially spreading the tip.

[0003] Patent Document 1 discloses a grommet-shaped component that can be attached without using tools, which is made of resin and is easy to attach and difficult to fall off after locking. This grommet-shaped component consists of a hollow or solid cylindrical main body and a flange-shaped portion for locking to an attachment member that protrudes above the cylindrical main body and is the object to which itself adheres.

[0004] Patent Document 2 discloses a paper grommet in which a paper tube is composed of an outer tube and an inner tube, and the outer diameter of the paper tube that engages with the diameter of the hole of the object to be stitched and the length of the tube that engages with the thickness of the object to be stitched.

[0005] Patent Document 3 discloses an eyelet in which a flange portion is provided around the upper opening of a cylindrical portion, and a plurality of grooves are provided concentrically on the lower surface of the flange portion.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0007] Eyelet-like components, such as those described in Patent Documents 1-3, have different shapes on the front and back, requiring them to be installed with distinction between the front and back. There is a need for eyelet-like components that do not have a distinction between the front and back and are aesthetically pleasing. Furthermore, there is a desire for eyelet-like components that are more durable than those made of resin or paper, and that are safer as they do not cause fingers to get caught. In addition, it is desirable that the processing and fixing of eyelet-like components can be done efficiently.

[0008] Therefore, the present invention aims to provide a grommet-like component that has no distinction between front and back, is durable and highly safe. Furthermore, the present invention aims to provide a method for manufacturing a grommet-like component that allows for the grommet-like processing and attachment to an object to be performed in a single step, has no distinction between front and back, is durable and highly safe. [Means for solving the problem]

[0009] The present invention (1) is, It consists of a hollow cylindrical metal part having an upper annular portion and a lower annular portion, The first return portion has a shape in which the outer edge of the upper annular portion is curled radially outward and downward, The outer edge of the lower annular portion is curved radially outward and upward, and the second return portion is a shape in which the outer edge of the lower annular portion is curved radially outward and upward, It has, The present invention provides a grommet-like component characterized in that the upper annular portion and the lower annular portion have substantially the same shape when viewed from above.

[0010] The present invention (2) provides the eyelet-like component of (1), characterized in that the first return portion and the second return portion have no breaks and the circumferential shape is uniform over the entire circumference.

[0011] The present invention (3) provides an eyelet-like component according to (1) or (2), characterized in that it is made of aluminum or an aluminum alloy.

[0012] The present invention (4) is, A cylindrical core rod, An upper mold having a lower annular recess formed radially outward from a lower circumferential portion having approximately the same diameter as the outer diameter of the core rod, A lower mold having an upper annular recess having substantially the same shape as the lower annular recess, which is formed radially outward from the upper circumferential portion having substantially the same diameter as the outer diameter of the core rod, A method for manufacturing an eyelet-shaped component from a metal tube having an inner diameter substantially the same as the outer diameter of the core rod, using the above, A first step is to insert the metal tube through the hole in the object, such that the upper end of the core rod through which the metal tube is inserted is located in the lower circumferential portion, and the lower end of the core rod is located in the upper circumferential portion, and to abut the upper annular recess and the lower annular recess, A second step involves pressing at least one of the upper mold and the lower mold in the axial direction to form a grommet-like component having a first return portion in which the upper end of the metal tube is curled along the lower annular recess, and a second return portion in which the lower end of the metal tube is curled along the upper annular recess, and then fixing it to the object. This invention provides a method for manufacturing eyelet-shaped parts, characterized by having [a specific feature].

[0013] The present invention (5) provides a method for manufacturing the eyelet-shaped part of (4), characterized in that the upper mold has a lower planar portion radially outward of the lower annular recess, the lower mold has an upper planar portion radially outward of the upper annular recess, and the upper planar portion and the lower planar portion come into contact with the object by pressing.

[0014] The present invention (6) provides a method for manufacturing the eyelet-like component of (4) or (5), characterized in that a plurality of grooves extending in the axial direction are formed on the inner surface of the metal tube.

[0015] The present invention (7) provides a method for manufacturing any of the eyelet-shaped parts described in (4) to (6), characterized in that the metal tube is made of aluminum or an aluminum alloy. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a snap-fastener-shaped part that has no front and back distinction, is difficult to break, and is highly safe. Further, it is possible to provide a method for manufacturing a snap-fastener-shaped part that has no front and back distinction, is difficult to break, and is highly safe, by performing snap-fastener-shaped processing and fixing to an object at once.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is a front view showing an example of an object to which the snap-fastener-shaped part of the present invention is attached. [Figure 2] FIG. 2 is a rear view showing an example of an object to which the snap-fastener-shaped part of the present invention is attached. [Figure 3] FIG. 3 is a side view showing an example of an object to which the snap-fastener-shaped part of the present invention is attached. [Figure 4] FIG. 4 is a perspective view showing an example of the snap-fastener-shaped part of the present invention. [Figure 5] FIG. 5 is a front view showing an example of the snap-fastener-shaped part of the present invention. [Figure 6] FIG. 6 is a side view showing an example of the snap-fastener-shaped part of the present invention. [Figure 7] FIG. 7 is an end view taken along line A-A of FIG. 5. [Figure 8] FIG. 8 is a diagram schematically showing an example of a cross section of the snap-fastener-shaped part of the present invention. [Figure 9] FIG. 9 is a front view showing an example of an object to which the snap-fastener-shaped part of the present invention is attached. [Figure 10] FIG. 10 is a rear view showing an example of an object to which the snap-fastener-shaped part of the present invention is attached. [Figure 11] FIG. 11 is a side view showing an example of an object to which the snap-fastener-shaped part of the present invention is attached. [Figure 12] FIG. 12 is a perspective view showing an example of the snap-fastener-shaped part of the present invention. [Figure 13] FIG. 13 is a front view showing an example of the snap-fastener-shaped part of the present invention. [Figure 14]Figure 14 is a side view showing an example of the eyelet-like component of the present invention. [Figure 15] Figure 15 is an exploded view showing an example of a jig for attaching the eyelet-like component of the present invention to an object. [Figure 16] Figure 16 is a plan view showing a mold, which is part of a jig for attaching the eyelet-like component of the present invention to an object. [Figure 17] Figure 17 is an end view of line BB in Figure 16. [Figure 18] Figure 18 is a diagram illustrating the manufacturing method of the eyelet-shaped component of the present invention. [Figure 19] Figure 19 is a diagram illustrating the manufacturing method of the eyelet-like component of the present invention. [Modes for carrying out the invention]

[0018] Hereinafter, an embodiment of the eyelet-like component of the present invention will be described with reference to the drawings. The eyelet-like component of the present invention consists of a hollow cylindrical part made of metal, and is fixed to both sides of an object by sandwiching the object between them, and can be used without distinction between the front and back sides.

[0019] Figures 1 to 3 show examples of objects 100 to which a grommet-like component 10 according to one embodiment of the present invention is attached. As shown in Figures 1 to 3, the grommet-like component 10 is attached to a hole in an object 100, which is, for example, a leather card case. Examples of objects to which grommet-like components are attached include bags and accessories, and the grommet-like component is used as a design accent or decoration on the object. The grommet-like component 10 is an annular member having a through hole 11 in the center.

[0020] Figures 4 to 8 show an example of a grommet-like component 10 according to one embodiment of the present invention. The grommet-like component 10 is made of a hollow cylindrical part. The grommet-like component 10 consists of a single component and does not require the combination of multiple components, resulting in high productivity.

[0021] The eyelet-like component 10 is made of metal, and may be made of iron or copper, preferably aluminum or an aluminum alloy. The eyelet-like component 10 is manufactured, for example, from an aluminum or aluminum alloy tube. Because the eyelet-like component 10 is made of metal, it is strong and resistant to breakage. Furthermore, because the eyelet-like component 10 is made of aluminum or an aluminum alloy, it is lightweight, corrosion-resistant, durable, easy to process during manufacturing, and has a beautiful finish after processing. In addition, the composition of the aluminum alloy can be adjusted according to the application and purpose.

[0022] The eyelet-like component 10 comprises an upper annular portion 12 and a lower annular portion 13. The eyelet-like component 10 is made of a single member in which the upper annular portion 12 and the lower annular portion 13 are connected by a cylindrical portion 14. The eyelet-like component 10 has a first return portion 15 in which the outer edge of the upper annular portion 12 is curved radially outward and downward, and a second return portion 16 in which the outer edge of the lower annular portion 13 is curved radially outward and upward. In the eyelet-like component 10, the first return portion 15 is fixed to one surface of the object 100 by its curved shape, and the second return portion 16 is fixed to the other surface of the object 100 by its curved shape. The first return portion 15 and the second return portion 16 secure the object 100 to both sides of the axial direction, allowing the object 100 to be firmly gripped from both sides, making it difficult to loosen or come off. By increasing the axial length of the cylindrical portion 14, it can be secured to objects of various thicknesses. It is also possible to fasten multiple objects together as the fastened body.

[0023] The upper annular portion 12 and the lower annular portion 13 have substantially identical plan view shapes. Specifically, the plan view shapes of the upper annular portion and the lower annular portion being substantially identical means that the outer diameter of the upper annular portion 12 in plan view is 80-120%, preferably 85-115%, and more preferably 90-110%, of the outer diameter of the lower annular portion 13. Because the plan view shapes of the upper annular portion 12 and the lower annular portion 13 are substantially identical, the eyelet-like component 10 has no distinction between front and back due to its shape or structure. The eyelet-like component 10 can have either the upper annular portion 12 or the lower annular portion 13 as the front, and both sides look good, resulting in an eyelet-like component 10 that does not require any consideration of front or back.

[0024] The first return portion 15 and the second return portion 16 are symmetrical vertically. The first return portion 15 and the second return portion 16 have no breaks, and their circumferential shape is uniform throughout the entire circumference. There are no discontinuities such as breaks in the first return portion 15 and the second return portion 16. A break refers to a notch formed radially inward from the outer edge of the upper annular portion 12 and / or the lower annular portion 13. The first return portion 15 has a shape in which the outer edge of the upper annular portion 12 is uniformly curled radially outward throughout the entire circumference, and is symmetrical in the radial direction. Similarly, the second return portion 16 has a shape in which the outer edge of the lower annular portion 13 is uniformly curled radially outward throughout the entire circumference, and is symmetrical in the radial direction. Because the first return portion 15 and the second return portion 16 are symmetrical, they have an aesthetically pleasing appearance. In addition, because there are no breaks in the first return portion 15 and the second return portion 16, fingers and other objects are not likely to get caught, making them highly safe.

[0025] Figures 9 to 11 show an example of an object 200 to which a grommet-like component 20 according to one embodiment of the present invention is attached. As shown in Figures 9 to 11, the grommet-like component 20 is attached to a hole in the object 200, which is, for example, a leather card case. The grommet-like component 20 is an annular member having a through hole 21 in its center.

[0026] Figures 12 to 14 show an example of a grommet-like component 20 according to one embodiment of the present invention. The grommet-like component 20 is made of a hollow cylindrical part. The grommet-like component 20 consists of a single component and does not require the combination of multiple components, resulting in high productivity.

[0027] The eyelet-like component 20 is made of metal, and may be made of iron or copper, preferably aluminum or an aluminum alloy. The eyelet-like component 20 is manufactured, for example, from an aluminum or aluminum alloy tube. The aluminum or aluminum alloy tube may be an internally grooved tube, in which a plurality of axially extending grooves are formed on the inner surface of the tube.

[0028] The eyelet-like component 20 comprises an upper annular portion 22 and a lower annular portion 23. The eyelet-like component 20 is made up of a single member in which the upper annular portion 22 and the lower annular portion 23 are connected by a cylindrical portion 24. The eyelet-like component 20 has a first return portion 25 in which the outer edge of the upper annular portion 22 is curved radially outward and downward, and a second return portion 26 in which the outer edge of the lower annular portion 23 is curved radially outward and upward. In the eyelet-like component 20, the first return portion 25 is fixed to one surface of the object 200 by its curved shape, and the second return portion 26 is fixed to the other surface of the object 200 by its curved shape. The first return portion 25 and the second return portion 26 secure the object 200 to both sides of the axial direction, allowing the object 200 to be firmly gripped from both sides, making it difficult to loosen or come off. By increasing the axial length of the cylindrical portion 24, it can be secured to objects of various thicknesses. It is also possible to fasten multiple objects together as the fastened body.

[0029] The upper annular portion 22 and the lower annular portion 23 have substantially identical plan view shapes. Because the upper annular portion 22 and the lower annular portion 23 have substantially identical plan view shapes, the eyelet-like component 20 does not have a distinguishing front or back due to its shape or structure. Either the upper annular portion 22 or the lower annular portion 23 can be the front, and the eyelet-like component 20 looks good from both sides, eliminating the need to worry about which side is which.

[0030] The first return portion 25 and the second return portion 26 are vertically symmetrical. The first return portion 25 and the second return portion 26 have no breaks, and their circumferential shape is uniform throughout the entire circumference. There are no discontinuities such as breaks in the first return portion 25 and the second return portion 26. A break refers to a notch formed radially inward from the outer edge of the upper annular portion 22 and / or the lower annular portion 23. The grooves on the surface of the upper annular portion 22 and the lower annular portion 23 shown in Figures 9 to 14 are fine irregular shapes and are not breaks. The first return portion 25 has a shape in which the outer edge of the upper annular portion 22 is uniformly curled radially outward throughout the entire circumference, and is radially symmetrical. Similarly, the second return portion 26 has a shape in which the outer edge of the lower annular portion 23 is uniformly curled radially outward throughout the entire circumference, and is radially symmetrical. Because the first return portion 25 and the second return portion 26 are symmetrical, they have an aesthetically pleasing appearance. Furthermore, since there are no cuts in the first return portion 25 and the second return portion 26, fingers and other objects cannot be accidentally caught, making it highly safe.

[0031] The eyelet-like component 20, which consists of an internally grooved tube with multiple axially extending grooves formed on the inner surface of a metal tube, has a striped pattern of fine grooves radiating outwards on the surface of the upper annular portion 22 and the lower annular portion 23, as shown in Figures 9 to 14. The presence of this pattern makes the eyelet-like component 20 aesthetically pleasing, well-presented, and unavoidable in terms of which side is facing up or down.

[0032] The eyelet-like components 10 and 20 of the present invention are manufactured by the method for manufacturing eyelet-like components of the present invention. The eyelet-like components are manufactured from metal tubing.

[0033] Figures 15 to 17 show an example of a jig 30 used in the manufacture of the eyelet-like component of the present invention. The jig 30 has a cylindrical core rod 31 extending in the axial direction, and an upper mold 32 and a lower mold 33 through which the core rod 31 is inserted. A metal tube 41 having an inner diameter approximately the same as the outer diameter of the core rod 31 is inserted through the core rod 31 (see Figures 18 and 19). The metal tube 41 is a metal tube, preferably made of aluminum or an aluminum alloy, and a tube made from scrap material can be used. The upper mold 32 and the lower mold 33 can be approximately the same shape and are a pair of molds arranged symmetrically above and below the core rod 31.

[0034] The upper mold 32 has a first hole 34 that extends axially and has approximately the same diameter as the core rod 31. The upper end of the core rod 31 is inserted through the first hole 34 of the upper mold 32. The diameter of the first hole 34 can be appropriately set according to the inner diameter of the metal tube 41.

[0035] The upper mold 32 has a lower annular recess formed radially outward from the lower outer edge of the first hole 34, i.e., the lower circumference. The shape of the lower annular recess (radial width and axial depth) can be appropriately adjusted according to the desired degree of curl of the first return portions 15 and 25 of the eyelet-like parts 10 and 20 to be manufactured. That is, the degree of curl of the first return portions 15 and 25 can be adjusted by appropriately adjusting the shape of the lower annular recess. A lower flat portion is formed radially outward from the lower annular recess. The lower flat portion is a flat portion that is substantially perpendicular to the axial direction of the upper mold 32. Although the lower outer edge, lower annular recess, and lower flat surface of the upper mold 32 are not shown in Figures 15 to 19, the upper mold 32 and the lower mold 33 are substantially the same shape and are arranged symmetrically. Therefore, the lower outer edge, lower annular recess, and lower flat surface of the upper mold 32 have the same configuration as the upper outer edge 36, upper annular recess 37, and upper flat surface 38 of the lower mold 33, which will be described below.

[0036] The lower mold 33 has a second hole 35 that extends axially and has approximately the same diameter as the core rod 31. The lower end of the core rod 31 is inserted through the second hole 35 of the lower mold 33. The diameter of the second hole 35 can be appropriately set according to the inner diameter of the metal tube 41.

[0037] An upper annular recess 37 is formed in the lower mold 33, extending radially outward from the upper outer edge 36 of the second hole 35, i.e., the upper circumference. The upper annular recess 37 has substantially the same shape as the lower annular recess. The shape of the upper annular recess 37 (radial width and axial depth) can be appropriately set according to the desired degree of curling of the second return portions 16 and 26 of the eyelet-like parts 10 and 20 to be manufactured. In other words, the degree of curling of the second return portions 16 and 26 can be adjusted by appropriately adjusting the shape of the upper annular recess 37. An upper flat portion 38 is formed radially outward from the upper annular recess 37. The upper flat portion 38 is a flat portion that is substantially perpendicular to the axial direction of the lower mold 33.

[0038] While a jig consisting of a core rod, an upper mold, and a lower mold has been given as an example, the jig is not limited to this. For example, a jig in which the core rod and the upper mold are integrated, or a jig in which the core rod and the lower mold are integrated, can also be used. That is, a jig in which the core rod is fixed to the first hole of the upper mold or the second hole of the lower mold may be used. In a jig in which the core rod is fixed to the first hole of the upper mold, a lower annular recess is formed radially outward from the lower circumferential portion around the core rod on the bottom surface of the upper mold. In a jig in which the core rod is fixed to the second hole of the lower mold, an upper annular recess is formed radially outward from the upper circumferential portion around the core rod on the top surface of the lower mold.

[0039] The method for manufacturing the eyelet-shaped component of the present invention is as follows: A cylindrical core rod, An upper mold having a lower annular recess formed radially outward from a lower circumferential portion having approximately the same diameter as the outer diameter of the core rod, A lower mold having an upper annular recess having substantially the same shape as the lower annular recess, formed radially outward from an upper circumferential portion having substantially the same diameter as the outer diameter of the core rod, A method for manufacturing an eyelet-shaped component from a metal tube having an inner diameter substantially the same as the outer diameter of the core rod, using the above, A first step is to insert the metal tube through the hole in the object, such that the upper end of the core rod through which the metal tube is inserted is located in the lower circumferential portion, and the lower end of the core rod is located in the upper circumferential portion, and to abut the upper annular recess and the lower annular recess, A second step involves pressing at least one of the upper mold and the lower mold in the axial direction to form a grommet-like component having a first return portion in which the upper end of the metal tube is curled along the lower annular recess, and a second return portion in which the lower end of the metal tube is curled along the upper annular recess, and then fixing it to the object. This is a method for manufacturing eyelet-shaped parts, characterized by having [a specific feature].

[0040] In the first step of the method for manufacturing eyelet-shaped parts of the present invention, using the jig 30 described above, the upper annular recess 37 and the lower annular recess are brought together such that a metal tube 41 inserted into the hole of an object is positioned such that the upper end of the core rod 31 through which the metal tube 41 is inserted is located on the lower circumference of the upper mold 32, and the lower end of the core rod 31 is located on the upper circumference of the lower mold 33. For example, as shown in Figure 18, the lower end of the core rod 31 is inserted into the second hole 35 of the lower mold 33, and a metal tube 41 having an inner diameter approximately the same as the outer diameter of the core rod 31 is inserted onto the core rod 31. As a result, the metal tube 41 is held on the lower mold 33. Then, as shown in Figure 19, the upper end of the core rod 31, whose lower end is inserted through the second hole 35 of the lower mold 33, is inserted through the first hole 34 of the upper mold 32. This causes the upper mold 32 and the lower mold 33 to face each other in a symmetrical manner with the metal tube 41 in between, and the lower annular recess and the upper annular recess 37 to abut. As a result, the upper end of the metal tube 41 abuts against the upper mold 32, and the lower end of the metal tube 41 abuts against the lower mold 33. By attaching the metal tube 41 to the core rod 31, which has an outer diameter approximately the same as its inner diameter, buckling of the metal tube 41 toward the inner diameter in the second step is prevented. Note that the objects are omitted in Figures 18 and 19.

[0041] In the second step of the method for manufacturing the eyelet-shaped part of the present invention, at least one of the upper mold 32 and the lower mold 33 is pressed in the axial direction to form an eyelet-shaped part having a first return portion in which the upper end of the metal tube 41 is curled along the lower annular recess, and a second return portion in which the lower end of the metal tube 41 is curled along the upper annular recess, and then fixed to the object. The pressing can be done with a vise or the like. When the upper mold 32 and the lower mold 33 are pressed vertically using a vise or the like, that is, the upper mold 32 is pressed downward and / or the lower mold 33 is pressed upward, the upper end of the metal tube 41 is processed to bend outward radially along the lower annular recess, resulting in an upper annular portion having a first return portion in which it is curled downward radially outward, and the lower end of the metal tube 41 is processed to bend outward radially along the upper annular recess 37, resulting in a lower annular portion having a second return portion in which it is curled upward radially outward.

[0042] In the second step of the method for manufacturing the eyelet-like part of the present invention, by pressing, the lower flat portion and the upper flat portion 38 come into contact with the object regardless of the shape (radial width and axial depth) of the lower annular recess and the upper annular recess 37, and the eyelet-like part having the first return portion and the second return portion is fixed to the object. The lower flat portion becomes the lower contact surface that abuts against one surface of the object, and the upper flat portion 38 becomes the upper contact surface that abuts against the other surface of the object. As a result, the metal tube 41 is processed into an eyelet-like part having a first return portion at the upper annular end and a second return portion at the lower annular end, as described with reference to Figures 1 to 14, the first return portion is fixed to one surface of the object by its curled shape, and the second return portion is fixed to the other surface of the object by its curled shape. By pressing the metal tube onto the object after it has been pre-set, the grommet-like processing and attachment to the object can be performed simultaneously, i.e., in the second step.

[0043] By manufacturing eyelet-like parts using the above manufacturing method with an internally grooved tube, which has multiple grooves extending axially on the inner surface of a metal tube, an eyelet-like part 20 can be obtained, for example, as shown in Figures 9 to 14, which has a striped pattern with fine grooves radiating outwards on the surfaces of the upper annular portion 22 and the lower annular portion 23. As the inner surface of the metal tube is curled radially outward, the inner grooves that were not exposed to the outside in the tube form become visible as a pattern. By utilizing internally grooved tubes, it is possible to manufacture eyelet-like parts with decorative patterns that are aesthetically pleasing and have a good appearance, without having to worry about the front or back side.

[0044] In the method for manufacturing eyelet-like parts of the present invention, the lower annular recess of the upper mold 32 and the upper annular recess 37 of the lower mold 33 are substantially the same shape, thereby producing eyelet-like parts in which the upper annular portion and the lower annular portion have substantially the same shape in plan view. This provides a method for manufacturing eyelet-like parts that can be used without distinguishing between the front and back, have a good appearance, are less prone to breakage, and are highly safe. If an eyelet-like part has a distinction between the front and back, it is necessary to pay attention to the front and back when attaching it, but with the method for manufacturing eyelet-like parts of the present invention, eyelet processing and fixing can be performed without worrying about the front and back.

[0045] In the present invention's method for manufacturing eyelet-like parts, the metal tube to be used as material is inserted into the hole of the object, mounted on a jig, and pressed, allowing for the eyelet-like processing and fixing of the eyelet-like part to be done in one step, resulting in fewer work steps and shorter working time. Eyelet-like parts can be manufactured from simple cylindrical metal tubes, and since no pre-processing is required, they are easy to manufacture. Furthermore, eyelet-like parts can be easily manufactured from metal tubes using a simple jig and a general-purpose vise.

[0046] According to the method for manufacturing eyelet-like parts of the present invention, the first return portion is secured to one surface of the object by its curled shape, and the second return portion is secured to the other surface of the object by its curled shape. Since the first and second return portions secure the eyelet to the front and back surfaces of the object on both axial sides, the object can be firmly clamped from both sides, making it difficult to loosen and difficult to detach. Furthermore, by appropriately selecting the length of the metal tube, eyelet processing and securing can be performed on objects of various thicknesses at once. It is also possible to fasten multiple objects together.

[0047] In the method for manufacturing eyelet-shaped parts of the present invention, the upper flat portion of the lower mold and the lower flat portion of the upper mold come into contact with the object by pressing. By appropriately setting the shapes of the upper annular recess of the lower mold and the lower annular recess of the upper mold, and ensuring that the upper flat portion and the lower flat portion come into contact with the object, the degree of curling of the first return portion and the second return portion can be adjusted.

[0048] The metal tube used in the method for manufacturing the eyelet-like component of the present invention may be a tube made from scrap material, as long as it is long enough to be fixed to the object. The eyelet-like component and the method for manufacturing the same of the present invention allow for the effective utilization of scrap material.

[0049] In addition, although the manufacturing method for the eyelet-shaped part of the present invention has been described assuming that the upper mold and the lower mold are substantially the same shape, it is also possible to use a pair of molds in which the lower annular recess and the upper annular recess are substantially the same shape, and the lower flat portion and the upper flat portion are substantially the same shape, but the shapes of the upper mold and the lower mold are different.

[0050] Furthermore, even if the lower annular recess and the upper annular recess have different shapes, or if the lower flat portion and the upper flat portion have different shapes, the grommet-like component manufacturing method of the present invention makes it possible to perform grommet processing and fixation to the object in a single step. A cylindrical core rod, An upper mold having a lower annular recess formed radially outward from a lower circumferential portion having approximately the same diameter as the outer diameter of the core rod, A lower mold having an upper annular recess formed radially outward from the upper circumferential portion having approximately the same diameter as the outer diameter of the core rod, A method for manufacturing an eyelet-shaped component from a metal tube having an inner diameter substantially the same as the outer diameter of the core rod, using the above, A first step is to insert the metal tube through the hole in the object, such that the upper end of the core rod through which the metal tube is inserted is located in the lower circumferential portion, and the lower end of the core rod is located in the upper circumferential portion, and to abut the upper annular recess and the lower annular recess, A second step involves pressing at least one of the upper mold and the lower mold in the axial direction to form a grommet-like component having a first return portion in which the upper end of the metal tube is curled along the lower annular recess, and a second return portion in which the lower end of the metal tube is curled along the upper annular recess, and then fixing it to the object. A method for manufacturing an eyelet-like part, characterized by having the following characteristics: This allows for the simultaneous processing and fixing of grommet-like components, providing a manufacturing method with fewer steps and shorter working times. Grommet-like components can be manufactured from simple cylindrical metal tubes, eliminating the need for pre-processing, thus simplifying manufacturing. Furthermore, grommet-like components can be easily manufactured from metal tubes using simple jigs and common vises.

[0051] While embodiments of the present invention have been described above, various modifications and changes are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0052] 10,20 Eyelet-like parts 12,22 Upper annular section 13,23 Lower annular section 15,25 First return section 16,26 Second return section 30 jigs 31 Core rod 32 Upper mold 33 Lower mold

Claims

1. It consists of a hollow cylindrical metal part having an upper annular portion and a lower annular portion, The first return portion has a shape in which the outer edge of the upper annular portion is curled radially outward and downward, The outer edge of the lower annular portion has a second return portion which is curved radially outward and upward, It has, An eyelet-like component characterized in that the upper annular portion and the lower annular portion have substantially the same shape when viewed from above.

2. The eyelet-like component according to claim 1, characterized in that the first return portion and the second return portion have no breaks and their circumferential shape is uniform over the entire circumference.

3. The eyelet-like component according to claim 1 or 2, characterized in that it is made of aluminum or an aluminum alloy.

4. A cylindrical core rod, An upper mold having a lower annular recess formed radially outward from a lower circumferential portion having approximately the same diameter as the outer diameter of the core rod, A lower mold having an upper annular recess having substantially the same shape as the lower annular recess, which is formed radially outward from the upper circumferential portion having substantially the same diameter as the outer diameter of the core rod, A method for manufacturing an eyelet-shaped component from a metal tube having an inner diameter substantially the same as the outer diameter of the core rod, using the above method, A first step is to insert the metal tube through the hole in the object, such that the upper end of the core rod through which the metal tube is inserted is located in the lower circumferential portion, and the lower end of the core rod is located in the upper circumferential portion, and to abut the upper annular recess and the lower annular recess. A second step involves pressing at least one of the upper mold and the lower mold in the axial direction to form a grommet-like component having a first return portion in which the upper end of the metal tube is curled along the lower annular recess, and a second return portion in which the lower end of the metal tube is curled along the upper annular recess, and then fixing it to the object. A method for manufacturing eyelet-shaped parts, characterized by having the following features.

5. The upper mold has a lower planar portion radially outward of the lower annular recess, The lower mold has an upper planar portion radially outward of the upper annular recess, The method for manufacturing an eyelet-shaped part according to claim 4, characterized in that the upper flat portion and the lower flat portion come into contact with the object due to the pressing.

6. The method for manufacturing an eyelet-like component according to claim 4 or 5, characterized in that a plurality of grooves extending in the axial direction are formed on the inner surface of the metal tube.

7. The method for manufacturing an eyelet-shaped part according to claim 4 or 5, characterized in that the metal tube is made of aluminum or an aluminum alloy.

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